# 定义ultrasonic类
class ultrasonic:
    def __init__(self):
        # ports= print(1)

        self.sers = 'ss'
    def two(self):
        ser = self.sers
        print(ser)

    def se(self):
        ss = self.two()

# 创建ultrasonic类的实例
my_ultrasonic = ultrasonic()
my_ultrasonic.se()
